Chemical Engineering March 2017 - 23

Metgec Systems
at two different points, allowing us
to achieve lower emissions without
fluegas recirculation. "
Gas is fired through a two-stage,
fixed-center mounted gun and multiple
spud system. He says as the
burner fires, it creates natural currents
within the furnace. The burner
entrains some of the internal gas inside
the furnace, which helps dilute
the fuel and is referred to as " internal
fluegas recirculation. " This recirculation
is enough to reduce emissions
while preventing the efficiency problems
caused by freezing in traditional
recirculation situations.
FIGURE 4. The Air Gas Ratio Control (AGRC) system measures and controls gas and air flows continuously
through a PID loop to provide less energy use and lower emissions rates
cuated air brings in moisture, which
can freeze in winter weather conditions,
building up inside the ducts
and fans and around the burner, "
says Joseph Arnold, head engineer
with Faber Burner Co. (Lock Haven,
Pa.; www.faberburner.com). " The
3421 BioN Modular ad_Layout 1 12/9/16 10:06 AM Page 1
way we've overcome this problem is
to develop burners, such as our L2E
burners, that don't require recirculation
of fluegas but still meet less than
30 ppm emission guarantees. This
burner runs off the principle of staging
the entry of fuel into the burner
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Circle 10 on p. 90 or go to adlinks.chemengonline.com/66426-10
CHEMICAL ENGINEERING WWW.CHEMENGONLINE.COM
MARCH 2017
23
Tighter controls
In the past, burners were simple
devices that didn't require complex
controls, but today's more complicated
systems often require ratio
regulators in order to optimize the
burner and provide
lower
emissions,
says Scott Latusek, application
engineer with Megtec Systems
(De Pere, Wis.; www.babcock.com/
megtec). " The goal of ratio regula

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Chemical Engineering March 2017

Table of Contents for the Digital Edition of Chemical Engineering March 2017